Death by acid was the fate of the sea monsters that perished in Earth's biggest mass extinction, some 251 million years ago.
Many animals and plants hold on to existence in fragments of their former homelands, surrounded by a flood of human farms and homes.
An asteroid impact crater in France is getting the honor of giving the "terrible lizards" their chance to take over the Triassic.
The latest work on frozen coral embryos and sperm will preserve staghorn coral from the Great Barrier Reef.
While the 'ice bears' will face some difficulties, the year 2112 may mark the final days for the animals. But, there is some reason to hope.
Last week yielded what appeared to be good news for polar bears.This week, not so much.
Using ancient plant ashes, scientists reconstructed a history of Earth's atmospheric oxygen levels over the last 400 million years, and laid to rest some lingering doubts about mass extinctions.
If a new theory is right, pieces of a comet that struck Earth 13,000 years ago might be coming around for another pass.
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